Long rumored, with a supposed edition reported ten years ago which vanished, it's coming! Tolkien's ca. 1926 prose translation of the great Old English epic, together with his detailed commentary. (No, the unfinished poetic translation isn't included)
Also, JRRT's unpublished story
Sellic Spell, an attempt to envision the Beowulf legend as an A-S folktale without the historical and mythological freight.
http://www.tolkienlibrary.com/press/....WYKb6id8.gbpl